分析化学2011，Vol.39Issue(1)：133-136,4.
氢氧化镁共沉淀法测定海水中纳摩尔级活性磷酸盐
Determination of Reactive Phosphate in Nanomolar Level in Sea Water with Mg( OH ) 2 Co-precipitation
摘要
Abstract
PO3-4 in seawater was co-precipitation by the formation of brucite [Mg(OH)2], initiated by the addition of NaOH. The precipitate was collected by centrifugation and dissolved in acidic solution for the determination of soluble reactive phosphorous (SRP) with classical phosphomolybdic method.Based on other previous study, the experimental parameters and conditions, including the volume of reagent, centrifugation speed and time, kinds of acid, H/Mo ratio, were optimized. A part of H2SO4 in mixed reagent was used for dissolved precipitate not only to keep the same medium with following phosphomolybdenum blue procedure, but also to speed greatly precipitate dissolved and reduce the high H/Mo ratio in solution before. Under the optimized conditions, the recoveries, blank and limits of detection of the proposed method were 97. 2％ - 100. 9％, (4.88-1-0.29) nmol/L, and 2. 42 nmol/L,respectively. The RSDs ranged from 2.1 ％ to 4.8 ％ for the seawater samples. The method had been used to determine the concentrations of phosphate in the upper water (0-200 m) of the Pacific Ocean successfully.关键词
活性磷酸盐/纳摩尔级磷测定/镁共沉淀法/寡营养盐区Key words
Reactive phosphate/ Low-level phosphate/ Magnesium-induced co-precipitation/ Oligotrophic area引用本文复制引用
徐燕青,高生泉,陈建芳,王奎,金海燕,袁梁英,李宏亮..氢氧化镁共沉淀法测定海水中纳摩尔级活性磷酸盐[J].分析化学,2011,39(1):133-136,4.基金项目
本文系国家自然科学基金项目(No.40676044)、国际海底区域研究开发"十一五"项目(No.DYXM-115-01-3-3)和国家海洋局第三海洋研究所基本科研业务费专项资助 （No.40676044）
